Electrically-heated flat-iron.



ELECTRICAL-LY HEATED FLAT IRON.

APYLIOATION FILED D30. 29, 1909.

Patented Aug. 1', 1911.

. ami yam UNI ED STATES PATENT oE- IoE.

RAYMOND w. BAKER, or NEW YORK, N. Y., TVICTOR L. KING, or WOODRIDGE, NEW

JERSEY, AND HERSCHEL c. PARKER, or NEW YORK, N. Y., ASSIGNORS T PARKER- cLABx'ELEcTmc commmg, or NEW YORK, N. Y., A CORPORATION OF NEwJERsEY.

ELECTRICALLY-HEATED FLAT-IRON.

Specification of Letters Patent.

Patented Aug. 1, 1911.

Application filed December 29, 1909. Serial No. 535,469.

To all whom/it may concern."

Be it known that we, RAYMOND WV. BAKER, of the city, county, and State of New York, VICTOR L. KING, of l/Voodridge, Bergen county, New Jersey, and HERsoHEL C. PARKER, of the city of New York, county of Kings, and State of New York, have invented a'new and useful Improvement in Electrically-Heated Flat-Irons, of which the following is a full, clear, and exact description.

Our invention relates to improvements in electrically heated flat-irons, and the object of our invention is to produce a flat-iron in which the necessary heat is generated within the body of the iron and is obtained by radiation from an electrical resistor ada ted to glow in the air upon the passage 0 an electric current through it.

' A further object ofthe invention is to produce a device in which the heating ele ment is not only inexpensive, butis also easily renewable. To this end we use as a heating unit a resistor, 'referably in filament form, which will glow immediately and continuously in the open air when a current of electricity is passed through it. We have found by experiments that a filament made of the substance known as silundum' has all these desired characteristics; This material -is a solid solution composed of silicon arbid dissolved in carbon. The method of producing silundum is fullyset forth in' our application for a patent for electric filaments or resistors filed November 26th, 1909, Serial No. 529,893. In this case we donot limit ourselves I to the use of the particular refsistor described, but this is the only one we know of which is entirely satisfactory.

Reference is to be had to the accompany ing drawings, forming a part of this speci fication, in which similar'reference characters indicate corresponding parts in all the views.

Figure 1 is a sectional side view of, the flat-iron. Fig. 2 is an inverted plan ofthe insulating block supporting the filament. Fig. 3'is an inverted plan of the cover of the ,iron. ,Fig. 1 is a plan view of the insulating mat, andiFig. 5 is a detail of the block support for the heating filament or unit.

I The flat-iron has the ordinary-handle attached to the top part 11 of the iron. The' top part is attached to th'e'base or face 12 by screws 14 through the holes 14* in the top. Between the top 11 and base portion 12 is a pad 13 of a material which is a nonconductor of heat and electricity. Asbestos fiber serves very well as such a material. The base portion 12 is hollow and adapted to contain the insulating block 15 which fits snugly in the interior of the 'base, the top of said block being flush with the upper \edge of said base portion. The back of the base is open so that the insulating block can be easily slid in and out.- Covering the entire bottom of the inside of the face portion is a thin sheet 16-of mica or other material which is a non-conductor of electricity. This is for the purpose ofinsulating the heating element by preventing any possibility of contact between it and the metal base. The lower surface oft-he block 15 is cut away as shown in Fig. 1, leaving a rim 15 around the two sides as shown in Fig. 2. I 1

The block 17'is held in place between the block 15 and the base 12. Plugs18 extend through the said .block 17 and into split tubesv 20 supported in the block 15. The plugs 18 have holes on their front surfaces adapted to receive the ends of the filament 19. The ends of the filament are inserted in these holes in the plugs, .and then held in place by a cement which is a good conductor of electricity. This provides a rigid support for the filament and also a-perfect electrical contact between the filament and the plug.

On the upper surface ofthe blocks15 are thin metal strips 21 held in place by screws 22 and connected with the upper portion of the tubes20. Extending into the hollow top part .of the iron are contact rods-23. These rods enter through perforations in the cover 11 and are insulated from the metal of said cover by collars 24, see Fig. 3. These rods are supported and held in place between the plate 25 and ribs 27 by the screw 26 which screws into the cover. The rods In order that the rods may contact with the strips'as above stated, the pad 13 is cut away as shown at 13 in Fig. 4. As the back of the base is'open, a thin metal plate 29 is providedwhich is bent over so that said bentover portion is adapted to be clamped and held in place between the top 11 and the mat 13, and the lower part of said plate forms a cover for the end of the fiat-iron.

It will thus be seen that we provide a flatiron in which the heating element is easily and quickly renewed. If a filament becomes broken or worn out, the top is removed by taking out the screws 14; the block 15 is removed and the block 17 replaced by another just like it having a fresh filament attached thereto. As no mechanical skill is required to do this, anyone using the iron can replace the filament in a few minutes. The face of the iron being heated by radiation from the filament, the heat is evenly distributed, and not as in other electrically heated flat-irons largely centered in the back part of the iron. a

Means for connecting the electric wires to the outer ends of the rods 23' are not shown as any desired method may be used.

The particular-form and arrangement of parts within the body of the iron may be changed without changing the principle of the invention.

We have set out a Very simple and efiective way to utilize the heating element for the'purpose desired, and we claim specifically the flat-iron shown, and also broadly a flat-iron which is heated by radiation from an electric resistor in filament form which will glow continuously in the open air on the passage of an electric current through it.

we clainnas new and desire to secure by Letters Patent 1. In an electrically heated flat iron, a heating unit comprising an insulating block, metal plugs extending through said block, means for securing said block in a flat iron, and a resistor in filament form supported by the plugs and extending from one side of the block.

2. In an electrically heated flat iron, a hollow top portion, ametal face detachably connected to said top portion, an insulating block contained within said face portion'and supporting upon its upper surface thin metal strips, contact rods entering said top portion and adapted to contact with said metal strips, a resistor in filament form supported within said, face portion, and electric connections between said resistor and said metal strips.

3. In an electrically heated flat iron, a

heating element comprising a resistor in filament form adapted to glow in the open air upon the passage of an electric current through it, a block of insulatingmaterial,

metal plugs extending through said block and adapted to support said resistor, said plugs extending above the upper surface of said block, a second insulating block, split netal tubes supported within said second block and adapted to contact with said plugs, and electric connections for the resister through said tubes.

4. A hollow flat iron having an insulating block extending longitudinally therein, the surface of the block next the face of the iron being chambered, a thin non-conducting strip between the chamber and the face of the iron, an open air glowing filament supported in the chamber'of the block and near the non-conducting strip, and electrical connections for the filament.

Witnesses:

WARREN (B. HUTCHINSON, ARTHUR G. 'DANNELL. 

